Harshaw TLD™ Model 8800 Plus Automatic Card Reader Instruments
The Harshaw TLD Model 8800 Plus Automatic Card Reader is controlled through screen dialogues, using the mouse to make selections from the drop-down menus. It can also be networked with Thermo Scientific™ Harshaw TLD™ Model 4500 Manual Reader and Thermo Scientific™ Harshaw TLD™ Model 6600 Plus Automated Reader in discrete or shared dosimetry applications.
| Description | Model 8800 Plus with EXT-RAD Option |
| Detector Type | Photomultiplier Tube |
| Dosimeter Reusability | <10% sensitivity change for 500 readouts (50 for EXT-RAD and DXT-RAD) |
| Dynamic Range | 7 decades |
| Product Type | Radiation Dosimeter Reader |
| Sensitivity | <10% sensitivity change for 500 readouts (50 for EXT-RAD and DXT-RAD) |
| Time and Temperature Profiles | Preheat temperature, 20°C to 200°C; Preheat time, 0 to 300 sec.; Acquisition time, 10 to 300 sec.; Linear temperature ramp, 1 to 50° per sec.; Acquisition temperature, to 300°C (option available to provide up to 400°C); Post-read anneal temperature, to 300°C (option available to provide up to 400°C); TTP Reproducibility, ±1°C |
| Batch Uniformity | ±30% maximum deviation from the batch mean without application of element correction coefficients |
| Capacity | Up to 1400 TLD cards including calibration cards, Seven 200-card capacity cartridges |
| Card ID | Codabar barcodes: interlaced 2 of 5, code 39 |
| Dark Current | <1μGy 137Cs equivalent dark current |
| Heating Method | Contactless heated N2 |
| Linearity | Less than 1% deviation |
| Radiation Type | Beta, Gamma, X-ray, Neutron |
| Reference Light | <1%High-voltage short-term stability, ±0.005% |
| Repeatability | <2% variation based on one standard deviation for |
| Stability | Based on one standard deviation of 10 consecutive |
| Throughput | TLD cards, 140 per hr.; chipstrates, 140 per hr.; DXT-RAD 140 single element dosimeters per hr. |
| Warm Up Time | <20 min. |
| Weight | 180 kg |
- Measures beta, gamma, X-ray and neutron doses, singly and mixed.
- Card readout has been accelerated up to 140 cards per hour.
- Thermo Scientific™ EXT-RAD and Thermo Scientific™ DXT-RAD extremity dosimeters are also processed automatically on carrier cards.
- Element Calibration Coefficients (ECCs), Reader Calibration Factors (RCFs) and card acceptance procedures are controlled by a new automatic QA program.
- Precisely controlled heating profiles offer consistent, repeatable glow curves, suitable for further analysis; precise, highly controlled, highly reliable linear heating by gas produces uniform heating, provides better reproducibility and extends dosimeter life.
- Backward compatibility with TLD-REMS and NETREMS software protects your existing records and enhances user skills
- Host computer with VGA color monitor.
- Menu-driven control of “expose”, “transport cards”, and “diagnostics.”
- Explicit on-screen text — no cryptics.
- The photomultiplier tube assembly is accessed for inspection or cleaning, as required, via a small clean-out drawer; carousels and clean-out drawer are accessible through hinged panels in the cover.
- Precise flow of hot gas to the four heater tubes for the TLD dosimeter elements is controlled by four precision flowmeters adjusted and balanced during factory setup.
- High-voltage potentiometers are mounted within the reader, allowing precise adjustment.
- Back panel controls include a keyboard enable/disable switch and connectors for keyboard, mouse, screen, serial port, and parallel printer port.
- Optional 90Sr internal irradiator.
- Optional UPS prevents loss of data during power failures.
Model 8800 Plus
Standard version, reads Harshaw TLD whole body, neutron and environmental TLD cards and extremity dosimeters on carrier cards. Includes reader, heating system, load and unload cartridges, card transport system, and single barcode reader. Thermo Scientific™ WinREMS™ Software runs on a separate external PC.
Model 8800 Plus EXT
Same as standard model, but includes a triple-head laser barcode scanner for reading EXT-RAD extremity chipstrates.
Model 8800 Plus DXT
Same as standard model, but includes a CCD camera for reading DXT-RAD extremity ringlets, EXT-RAD chipstrates and other standard Harshaw TLD cards.
Note: No annealing required; anneal part of the heat cycle can be used to remove residual signal after exposure to a high dose.
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